Improvement in grain-separators



w. H. LAWRENCE.

improvement in, Grain Separator.

No, 120,285, Patented Oct. 24,1871.

A? Q I IM PHOTO-1771065117110 00- M Y (035051151 P51705551) UNITEDSTATES PATENT Orrrcn.

WILLIAM H. LAWRENCE, OF BALTIMORE, ASSIGNOR OF ONE-HALF HIS RIGHT TO D.A. EDIE, OF MORRISVILLE, AND ONE-FOURTH HIS RIGHT TO H. O.

KARR, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN GRAlN-SEPARATO RS.

Specification forming part of Letters Patent No. 120,285, dated October24, 1871.

To all whom it may concern:

Be it known that I, WILLIAM H. LAWRENCE, of Baltimore, in the county ofBaltimore and State of Maryland, have invented a new and valuableImprovement in Grain-Separators; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawingmaking a part of this specification. and to the letters and figures ofreference marked thereon.

Figure 1 of the drawing is a vertical longitudinal section of myinvention. Fig. 2 is a transverse vertical section of the same. Fig. 3is a detailed view of the cams.

This invention has relation to certain improvements in grain-separators;and consists in the construction and arrangement of devices by means ofwhich a double and tossing motion is given to the screen-box, vibratory,or longitudinally reciproeating and vertical.

In the accompanying drawing, A designates the screen-ease, furnishedwith the screens B B. and bottom 0, each communicating with a separatespout attached to the forward end of the screen-box, so as to dispose ofthe different particles separated by the screens. The screen-box isarranged at an incline within its frame, and is supported at its higherend by means of a transverse bar, D, the ends of which are held by apair of perforated arms, E, secured at their lower ends to a bar, F,which is journaled to the frame G by means of boxes g. g designatesboxes supporting the ends of a shaft, g, on the frame G. The shaft 9 isprovided with a pair of elliptical cams, h, secured to it near eitherend, and arranged at right angles to each other, as represented in thedrawing. Of each pair one cam is furnished with a pin or stud, h,projecting from its face. The cams are designed for the purpose ofgiving an up-and-down motion to the screenbox; their points alternatelyraising the box as the shaft g is rotated, and allowing it to fall inthe spaces between them. Hdesignates a spring,

consisting of an elastic plate properly bent and secured to the underside of the screen-box. The

object of said spring is to give a slight recoil to the box as it fallson the cams, thereby counteracting the shock, and giving a more uniformmotion to the box in its rise and descent, as well as protecting theedges of the cams and the bottom of the box, which they would otherwisestrike. I designates arms or studs depending from the under side of thescreen-box in such a position that the pins on the face of the camsshall strike against them when the cams are in motion, thereby throwingthe box forward at each period of contact. The weight of the box and itsinclined arrangement carries it back after the pins have passed. Theobject of the longitudinal and vertical reciprocating motions of thescreen-box is to perform the work of screening grain in a more thoroughand rapid manner by shaking it over the screens with violence. Jdesignates the hop,- per, supported on top of the frame-standards K, andperforated to let its contents fall on the upper screen. L represents aslide, adjustable at either end Within grooves cut in the sides of thescreen'box. The grain falls from the hopper above said slide, underneathwhich is a narrow passage, extending across the screen, which allows thegrain to pass through in a thin sheet, in which form it extends oversaid screen and is more effectually screened and separated. The slidemay be adjusted to let different quantities of grain pass underneath,when desired.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination of the rotating elliptical cams h, springs H, pin h, andarms I, substantially as and for the purpose specified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

WM. H. LAWRENCE.

Witnesses:

D. R. COLLIER,

D. HAGERTY. (159)

